A mean field study of single-particle spectra evolution in Z=14 and N=28 chains

TL;DR

This study investigates how tensor forces influence the evolution of single-particle energy levels in silicon-42 using mean field models, revealing that tensor interactions significantly reduce proton spin-orbit splitting.

Contribution

It provides a detailed analysis of the role of tensor forces in single-particle spectra evolution in Z=14 and N=28 chains using both non-relativistic and relativistic mean field models.

Findings

Tensor force governs reduction of proton 1d spin-orbit splitting.

Reduction of neutron 1f(7/2) subshell closure is not clearly linked to tensor force.

Different mean field models agree on the importance of tensor interactions for proton levels.

Abstract

We study the mechanisms which reduce the proton 1d(3/2)-1d(5/2) spin-orbit splitting and the neutron 1f(7/2) subshell closure in 42Si. We use various self-consistent mean field models: non-relativistic Skyrme-Hartree-Fock and relativistic density-dependent Hartree-Fock. Special attention is devoted to the influence of a tensor component in the effective interaction. It is found that the tensor force indeed governs the reduction of the 1d proton spin-orbit splitting. On the other hand, the reduction of the neutron 1f(7/2) subshell closure is not clearly related to the tensor force.